please bump https://gitlab.gnome.org/GNOME/gjs/-/tags and update HOMEPAGE Reproducible: Always
Why do you want a highly experimental development version? gjs-1.64 would be another matter, but that would get marked as DUPLICATE of a gnome-3.36 tracker. The HOMEPAGE update request seems relevant (current says it's migrated to gitlab wiki, which in turn says it's migrated to doc/ folder in the source tree, linking to a Home.md)
I don't think there's any value in this remaining open.